Photoluminescence Studies of Germanium Using a Neodymium Laser.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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Irradiated and non-irradiated germanium samples were studied at liquid He temperatures with the technique of photoluminescence produced by a commercial NdYAG laser. In a continuous mode, the laser was used with conventional lock-in amplifier techniques to obtain luminescence intensity vs energy spectra and in a pulsed mode the laser was used with a boxcar integrator to obtain both energy spectra and recombination lifetime data. Intrinsic band-to-band spectra were studied with the laser in either the continuous or pulsed modes while extrinsic radiation defect spectra could not be observed in the pulsed mode. Continuous laser excitation produced intrinsic band gap and extrinsic defect spectra that were identical to previous results using a high intensity tungsten lamp as the excitation source. Author
- Solid State Physics